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The KTP-445A connects to any 2005 and newer Alpine headunit that uses a black power harness. It will not work with the CDE-100 or IVE-W530 receiver.

KTP-445A Power Pack and harnesses

Want a simple way to kick up the power of your Alpine receiver? Alpine's "Power Pack" amplifier increases your receiver's power output to 45 watts RMS power by 4 channels — plenty of power to drive high-performance speakers or keep up with a big subwoofer amplifier.

Installation Note: We recommend running a dedicated constant power wire to the battery for optimal performance from this Alpine amp — we offer an inexpensive wiring kit for this installation. This high-powered amp won't work in systems where an outboard factory amplifier is still active.

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Product Research

Features

Overview: The Alpine KTP-445A Head Unit Power Pack is an
easy-to-install power upgrade amplifier that allows you to add higher output and
more dynamic response to your Alpine head unit. The KTP-445A amplifies your
Alpine head unit's power output, resulting in a 150% power increase over
the original power from the head unit's built-in amplifier.

Notes:

Because of its high-powered amplifier design, the Alpine KTP-445A
does require that a separate +12V constant power wire is run to the
battery with a separate inline 15A fuse in vehicles with lower than a
15A fuse protecting the factory radio. Check out the "Accessories" tab
for wiring kit.

This Alpine high-powered amp won't work in systems where an outboard
factory amplifier is still active. If used in vehicles with a factory amplifier, the
factory amp will need to be completely bypassed (this may result in lost speaker
channels, if factory amp has more than 4 channels).

The increase in power
may result in a louder warning chime in certain vehicles.

Compatibility: The KTP-445A connects to any 2005 and newer Alpine head unit that has a black
16-pin wiring harness. Please check with your Crutchfield Product
Advisor to confirm compatibility.

45 Watt x 4 Channel Amplifier: The Alpine KTP-445A Head Unit
Power Pack employs a 45 watt x 4 channel amplifier. The amplifier offers an
unbelievably low noise floor, taking extra care to ensure a clean signal path,
with no extraneous interference. The end result is a 1 Watt Signal-to-Noise
Ratio of 82dB or better. Uniquely, the amplifier distortion actually decreases
at higher frequencies, resulting in a clean and clear signal where your ear is
most sensitive to distortion.

Note: The specifications given by Alpine for the built-in
amplifier comply with the CEA-2006 mobile amplifier power testing and
measurement standards from the CEA (Consumer Electronics Association). All
manufacturers who comply with the standard can display the CEA-2006 logo on
their product.

Installation: Since the KTP-445A is small and compact, it
installs behind your Alpine head unit in the dash of most vehicles. Installation
is simple with no special
tuning. The 39" grey connector harness plugs into one end of the Head Unit
Power Pack and connects to the rear plug on your Alpine head unit. The 31"
black
connector harness plugs into the other end of the Head Unit Power Pack and
connects to your Alpine receiver's harness (included with your
Alpine receiver). You will need to splice or crimp the wires from the Alpine
receiver's harness to a Crutchfield vehicle harness adapter (sold separately).

Note: The factory radio circuit needs to be a minimum of
15A. If it is not, a separate power and ground will need to be installed for
the KTP-445A

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to
find elsewhere. That's because we have our own in-house Product Research
team. They verify what’s in the box, check the owner's manual, and record
dimensions, features and specs. We stay on top of new products and technologies
to help people make informed choices.

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So easy!

This thing is such an easy addition to improve your car audio. I've installed several larger amp set ups of varying complexity in mine and my friends cars over the years but I gotta say, I don't think I'll be doing it again anytime soon. This class D amp does a great job for its size and its ease of installation. Literally, all I had to do was splice an Alpine wire harness to the car head unit harness, find a clever place for it and the job was done. So easy and I'm honestly amazed at how much power is produced, I don't even run this thing close to full volume and it bumps the car.

Super simple

This amp is a great addition for those of us that have small cars and who may not want to run additional wires. This really boosted the sound quality of my Alpine head unit. The sound isn't super crisp on the highs but it is warm overall. I think that you sacrifice some quality for the easy installation and use.

Alpine KTP-445A Power Pack

Just installed new speakers before adding this amp. The sound before adding the amp was good, but when I plugged in this amp the sound was great. And when I say plugged in it was just that easy to hook up, I spent a total of about 20 minutes and most of it was to find a location for the amp.

Great addition to your Alpine HU order

Written By Chumly, San Diego on Saturday, January 03, 2015

I ordered this w/ the 154BT HU & 6.5" S-model components for a '95 Miata. I test ran just the HU and speakers then put the top down and went for a spirited drive. Muttered, "decent", then went back for the amp install. Amazing and instant improvement!

My install wasn't plug-n-play as it should be; I'm complicated. The Miata doesn't give you much space and the wires are quiet long. I cut the harnesses down and soldered and heatshrinked so it wasn't so cluttered and stuffed. I'm sure it'll get warm. I also put the OEM adapter on this amp instead of the HU, again less clutter.

I ran a fused 14G wire from the yellow to the battery in the trunk. It takes 10min and easier than getting to my fuse block just to see if it's 15A or not. There is a 15A fuse on the amp, a 10A on the HU, & I used a 20A on the bat run so they are individually protected.

NA Miata owners, this fits nicely behind the metal bracket behind the HU, like it was meant to be there.

Pros:-Must have with any Alpine HU install w/ aftermarket speakers. Install "can" take 30 minutes max and really is plug-n-jam.
-Priced very fairly given other options can easily double the cost once installed and done.

Cons:-Don't know what the 2 hold-down brackets are for. No hardware for them and instructions just show how to plug it in.
-Connectors are TIGHT. They do secure nicely but takes a lot of effort. Do this part before working in tight spaces.

Clean sound in a small packae

Very easy to install in with a new alpine ine-w940, just plug and play. Greatly improved the sound in a complete car stereo upgrade. Installed in 4th gen 4runner in the small compartment inside the glovebox.

Alpine KTP-445A

very easy to mount and simple connect to the Alpine 149BT receiver..Boosts as it's advertized..When I got the 149BT Radio/CD player I was dissapointed at the low wattage...it barely tickled the JBLs in my truck. this unit should have been built into the alpine receiver for the cost of it.

Definitely the "secret sauce" in my vehicles

Written By doa70, NJ on Thursday, October 16, 2014

This has just enough punch to take your base head unit that does less than 20w RMS and adequately feed speakers capable of handling over 80w RMS. Sound quality is excellent, it's not loud, just a great, full sound. I've added this to two all Alpine systems now and it is definitely the key piece of gear that brings it all together.

Nice punch for the price

Added a good deal of punch and volume to my system. A good complement to my Alpine deck, and well worth the price. Installation was easy and straightforward. I was even able to mount it in the dash behind the stereo, though it was fairly tight.

Alpine KTP-445A Power Pack Review

It sounds great. Its small and will fit in a lot of places. I dont have a lot of room in my truck so this fits well. As a kid I always wanted some alpine gear, now I have some, now I am happy. I have it paired with alpine 6.75s and alpine 5.25s.

Pros:Fits behind my head unit in the dash of my 02 dodge dakota. Its small, stays cool, it doesnt overheat and shut off due to being inside my dash. You could mount this easily in a glove box or small console.

Cons:None really. Check your system, it required a larger power source then the 10a power source dodge provided. My alpine head unit and this require at least a 25a fuse.

Couldn't Be Any Easier

I purchased this amp to compliment the Alpine CDE-143BT I purchased to replace a older Alpine head unit. Installation could not have been any easier. The wiring harness only connects one way, so mixing up the wiring is not a concern. Alpine supplies more than enough wiring to place this nearly anywhere in your dash and its compact size is perfect.

I did however, go back and forth between having the speakers driven by this amp and just the head unit and did not noticed a huge difference. That may be due to the speakers (4 Pioneer TS-G1644R 6.5"'s), although they are rated at 40 watts RMS and this amp is rated at 45 watts RMS, which should be pushing them quite well. just wish I knew how to test the actual wattage at my speaker connections to ensure the amp is working correctly.

Pros:Easy to install, no need for extra wiring as with other amps.
Compact size easily fits inside of my dashboard.
Lots of length to the wires for ease of placement.
Ample power to push most entry level speakers.

Cons:Cannot tell if amp is on or not as there is no indicator light. I guess that is because it's intended to be installed out of sight in your dash.

Decent and seamless with alpine HU

I bought this to add a bit of oomph to the Alpine CDE147BT HU I bought last year (this model is discontinued). I like that it's compact and has seamless connectivity to my HU. I was able to easily place it behind the temp control panel in my 4Runner-- it has little heat generation so you can stuff it pretty much anywhere. The power it adds is not substantial-- ~4db overall-- but i didn't want it to blast music, I just wanted to have my factory speakers push it out in all ranges a bit more at lower volumes. This amp it does. I'm happy with the sound-- if I wanted improvement I'd have to replace the factory speakers, which I'm unlikely to do with this vehicle. In general it has added depth and clarity to what is already a great sound from this head unit. I can't vouch for its overall power for those looking to blast the neighborhood from their car-- if I tried that I'd likely blow my factory speakers. But if that's what you're looking for, I'd start shopping for hearing aids since you're gonna need them, boyo. Installation was a breeze-- it's completely plug and play with alpine head units.

Pros:Easy to install
Price
Very small footprint
Decent power boost for existing HU

Easy Upgrade

Installation was as simple as plugging the amp in. The results far outweigh the cost and make my 4 Polk 6X9 speakers shine. The length of the provided wiring made it possible for me to place the amp in the glovebox which was not ideal but space behind the dash on my 02 Ranger is very limited. The improvement in sound is enough to make me hesitate to spring for a subwoofer.

Pros:Too easy to install - plug and play and forget
This one is matched to many Alpine head units - do your homework
Best for those who want better sounds in the car...maybe not for those who need to rattle rivets and spot welds loose.

Sounds great

Sounds Good, it really does. My car is a Honda Civic Si (2005) with an Alpine Stereo, and factory-installed speakers. My friend has since warned me that the new Power-Pack thing might damage my speakers down the line, something to do with the speakers receiving more power than they are designed for, even if I don't blast the volume. I've had the system in my car a few days now now and it sounds really good. If you don't think about it, or you're concentrating on stirring conversation with whoever else is in your car, you might not notice at first, but when you put on music that was recorded with quality, it sounds great. I should note that I'm listening to music through my ipod, which is connected to the Alpine stereo's USB jack.

Great upgrade for 2004 Miata

This is a beefy little mighty-mite. I shortened the wiring harnesses (using solder and heat-shrink tubing) and padded and mounted the unit to some of the dashboard framing to the left of the glovebox in my 2004 (non-Bose) Miata.

I connected the unit to an Alpine UTE-52BT head unit and ran the yellow battery lead over to a vacant 20-amp "audio amp" fuse socket in the under-dash fuse panel using an Add-a-Circuit adapter from Pep Boys, for power.

This thing really woke the stock speakers up; they play loudly and with excellent bass. Absolutely no complaints at all.

Pros:Compact and powerful. Easy to connect.

Cons:Not required, but to save space and lower impedances I chose to shorten the wiring harnesses to make it fit better, but that was no big deal.

Alpine KTP-445A Power Pack

This is the perfect amp to seriously upgrade your system. It was simply plug and play with my alpine head unit. Up and running in under 10 minutes. This is not for thumping the trunk but for serious and very clean can only hear the music sound!

So easy it scared me..

Way to easy to get the additional sound out of my Alpine CDE W235BT unit. I have a very basic install with 4 Alpine speakers so I was not sure the Amp would make a big difference. Wow it really does. I need to turn it up a tad to get full effect but not a problem. The first one I got with the head and speakers had issues. One phone call, 3 minutes on the phone and a new was delivered a day and a half later with return shipping stuff. Then came the reinstall....5 minutes back in business.

Pros:Easy to plug into Alpine Head. Great clean sound. Small with long wires for each side; easy to bundle or leave long for remote install. Oh and the great Crutchfield service and support. Basic simple instructions.

not just plug n play

I added the Alpine power pack amp to my alpine HD radio HU , with four new Polk audio 6.5 coaxial speakers the new sounds in my 1999 camaro are impressive for the little amount of money invested,even with the top down I still get rich powerful sound, I think a sub woofer will be my next move to add that deep bass richness we all desire.the only con to the install was the fact that it wasn't an easy plug and play as advertised, if you own a camaro with the factory Monsoon stereo you have to remove the factory amp and run all new speaker wires it was a lot more work than I anticipated ,worth it but still a lot of work!

Powerful Amp

This amp connected easily to my new Alpine UTE-52BT. It is great not running the amp to the battery through the firewall. It makes a big difference in the clarity and power of the sound. I do wish it had a gain control. Works great though.

Alpine Power pack KTP-445A

Great addition to my CDE-151 receiver, much better sound quality, easy to install, easy to understand wiring diagram, need to replace oem rear speakers on my truck now to get full benefit of power pack, Will be getting back to you guys on rear speakers. Thanks Crutchfield.

Pros:ease of installation, great instructions, sound quality and power, great buy for the money

Cons:used double sided tape on mine also to mount directly under dash on floor board. Purchased plastic flexible conduit to cover excess wire to unit, much better look and protection of wires.

Small Amp With A Lot Of Punch!

Great addition to my Alpine CDE-153BT radio purchase. The long wiring harnesses actually assisted in my installation. Without the extra length of these harnesses, I would have had to add extension wires to my H/U wiring harness. The power and clarity my H/U produces is amazing! I wish I had installed the H/U without the amp attached first so I could compare the output of the H/U before and after attaching the amp.

Pros:Quick connects are very convenient for installing harnesses. Small footprint made installing amp in hidden location quick and easy.

Cons:Including some double sided tape with this unit would have been handy. I could not figure out how to use the enclosed brackets so I purchased some thick double sided tape and taped the unit down in its final location.

Awesome upgrade

Excellent addition to my alpine radio. Runs a set of JL audio component speakers in the doors. Night and day difference. Really made these speakers shine. A must have for alpine radios to get the most out of your speakers.

Pros:Small. Mounts nearly anywhere. Just the right amount of power. Great value IMO

Good value amp

decent value for the money.. Don't buy this amp if you're looking for a high performance competition sound.. It did, however, upgrade my stock stereo to a very satisfactory level.. I would purchase again.

Pros:install was a snap with plug and play (paired with Alpine UTE52BT)

Cons:For my application, way too much wire. I did not want to cut and splice, so I've bundled them all together behind the dash.

Would buy again without thinking twice!

I took a leap of faith in ordering this little amp. I had previously upgraded all my speakers and added a subwoofer in my '02 Ram single cab. I already had a 750w RMS amp, so I didn't feel like adding another one and doing all the wiring and use power and ground distribution blocks. It's just more work and way more expensive that way. Instead I decided to add the KTP-445A to my CDE-102 headunit and I am glad I did. My rear cabin speakers are rated at 45 watts and sound great. My door speakers are underpowered by 55 watts, but sound way better than they did before. I noticed things in some songs that I hadn't heard before. I used to play my music at 21 of 35, but now I keep it at 19. It sounds punchier and louder, but clear. Once I adjusted my crossovers and other settings, my speakers blended in perfectly with my sub. Had I known about this before I would've done it sooner. I didn't know what to expect, but now I can honestly recommend this to anyone. Hardest part is figuring out where to mount the amp. Crutchfield had a great price and I recieved the package on time as promised.

Good power, small size.....really?

Bought this Power Pack to go with my 143BT for the reason that I did not want to install another large amp in the back of my 4Runner (due to storing my mountain bike in the back). I will admit, I had a hard time believing that this little package was going to supply enough power to make my Infinity components sound good. Heck, I come from the days where the heat sink on your amp was twice the size of the amp itself! No more, this unit delivers the clean and efficient power that I need to keep up with my JL audio 10" DVC sub. The connection was simple, and the wires were sufficient length. My only gripe is that the connections require a little "push" to ensure they are seated. Make sure you push in until you hear the "click".

Pros:Small size, good power, easy install.

Cons:Loose connector if you don't take the time to ensure you "click" them in. No gain control on the amp. Like I said, I am old school, and am used to adjusting my amp gains. I just need to get used to not having one. Not a big deal.

Perfect amp for an Avalanche

I have a 2013 Chevy Avalanche and the back seats lay down extending the length of the truck bed which is great but does not provide any room for amps or sub woofers in the back seat. There is very little space under the front seats so this little Alpine amp fit perfectly under the center console.

Pros:It is small and easy to fit in places with little space. The harnesses were plug and play with the Alpine head unit and the custom harness that came with the Alpine head unit from Crutchfield. Wiring literally took 20 seconds. The sound range and output levels were impressive for such a small package. A definite pro is that you don't have to run separate fused power to the battery like the bigger units.

Cons:Power is 45x 4 which is not heavy duty but for the average audiophile, it is sufficient.

Nice power

Matched this up with an Alpine CDE-SXM145BT in my 2013 Mustang. Super install with just a few plugs. No splicing needed. This really lit things up. Good, strong power without having the normal distortion on the low end. Seems to me that as easy as this is to install, it's a no brainer to buy this for your Apline. I did not need to change any fuses either. Car electrical circuit runs this without issue.

Great Sound

Purchased two units, one for my car and one for my daughter's car. Sound quality is excellent. Installation very easy. Had to return one of the units for a low level hum that developed after it was powered on about 10 minutes that could be heard when the volume was lowered to zero. Crutchfield replaced it with free shipping - awesome customer service! I have owned many Alpine products through the years and this is the first problem I have ever had - plan continue to buying Alpine products in the future.

Awesome unit

If your alpine is new enough to use the power pack buy it! Well worth the money, I would buy it again with out a second thought, it has just enough power to keep the door speakers up with a sub, and its clean power and such a easy install!

Pros:Easy install, lots of power for such a small unit, plug and jam lol!

Couldn't have been a better product for what I needed

Great product for my needs. I just needed a small amp to power the speakers I installed in my wrangler and this was perfect. I'm no car audio expert so the plug and play set up was ideal, and the result in the sound was well worth the money. It's small in size so you can easily conceal it, and the wiring is plenty long to put it in just about any location.

GREAT SPEAKERS

Please read

Written By ACE, Muscle Shoals, AL on Saturday, January 18, 2014

I installed this with an alpine 149bt. The 1st unit from alpine was doa. The second had a high pitch whine that I'm certain is picking up noise from the fan in the alpine head unit. It sounds fine but cuts out well before clipping. The head unit power is cleaner all the way up to distortion. I tried running extra power and ground but nothing helped. I think this unit would work better with a lower powered head unit. I have been installing for years and love alpine, but this one didn't work out for me. Will install a normal 4 channel amp from alpine. Just dread the wiring. Ugh.

Little extra Oomph

Competent piece of equipment. Not going to shake the car apart. Will help at highway speeds and loud metro areas. Made idiot proof ( note oem radio fuse MUST be 15 amp) , install takes no time at all, just wire routing in dash.

Pros:Simple, Simple install. Small form factor. Long wires (con to some)

Easy Upgrade

Easy to install and hide. Adds much better power to my Alpine head. It's not a 'monster' amp, but I was not expecting it to be either. I read many of the reviews here prior to purchase and had a pretty good idea what to expect. Of course now it has me thinking I should add a small sub in my truck.........

Alpine KTP-445A amp

Written By Brandon B, Charlottesville, VA on Saturday, December 28, 2013

This was purchased for me as a Christmas present at the Crutchfield store in Charlottesville. The new store is pretty cool with basically a touchscreen version of the website on every display table. It makes it really easy to compare product specs. The salesmen are attentive but not too pushy. My only knock of the store are that it doesn't come close to displaying all their available items, and you can't test most of the stuff (including speakers) out.

Installation of the amp went pretty well. It's as easy as pulling out your head unit, unplugging it from the car, finding a good spot for the amp, then wiring the amp between the head unit and the car. It took me about 30 minutes total. 20 minutes of that was spent wedging the amp into a very tight spot behind the dash. Installers beware - the plugs on the wiring harnesses do not fit securely, that is, they don't "click" in, I had everything reassembled after testing only to find that my signal was going in and out due to a poorly connected harness.

The sound is a huge improvement over my HD137BT's internal sound. I guess my speakers were actually capable of much more. The sound is richer, the bass fuller and less prone to distortion. The best part is how much better it sounds at low volume. I found myself turning up the volume before just to get more bass. Not necessary now. Overall, I'd say the power pack is a great value, especially if you don't want to get into a much more complex install involving a traditional amp.

Alpine KTP-445A Power Pack

Fantastic Little Amp

Written By NickS, San Clemente, CA on Friday, November 15, 2013

Fantastic little amplifier; Installed with the Alpine CDE-143BT in a 2010 Ford Focus SE running the stock speakers (no stock sub). I didn't test the setup without the amp, but at the moment I only need to turn the receiver up to about 10 volume wise to achieve great sound, at a volume loud enough to distinguish vocals from outside the car with the doors closed. I had to run the this through a PAC C2R-FRD1 before outputting to the speakers, but so far the adapter has had no compatibility issues and runs perfectly.

Pros:Small, Mountable virtually anywhere, 45Wx4 with no connections other than to the back of the radio!

Cons:There is at least a foot, possible more of spare wire on each side, but in some cases this may be a pro.

Great little amp!

Great little amp! I was in the market to upgrade my factory sound system in my car and didn't want to go crazy with amp wiring, etc, etc. Upon opening the box I was still shocked at how small this amp was. Due to this I was able to easily locate it on the inside drivers side part of my Civic's dash board with zip ties. I did not want to use the little mounting brackets because they just weren't the best option for me. Powering 4 Polk 6.5 coaxials this little amp works these speakers out! Sound is great!

A little more...oomph!

I installed a CDE-HD149BT head unit and initially I was going to send this amp back because I thought it wasn't needed. Then I decided to try it and well, it's a keeper. It doesn't add appreciably to the noise or distortion and it provides about 3dB more output than the head unit alone. This is just what I needed to get that little extra oomph. The installation couldn't be easier. It's literally plug and play...LOUDER! lol

Works as expected

Easy to install. I hid mine behind the carpet in the passenger floorboard up near the dash. I didn't try out the Alpine 143BT head unit before installing this so I am not sure of the amount of improvement. The sound is nice and full.

All alpine

Compact amplifier is simple to install and works great. Uses the same power as the Alpine receiver. Not overly powerful (45 Watts/channel) but adds a lot of dimension to the sound. I get much more out of my MOMO speakers.

Pros:Super easy to install. Made to work with many Alpine receivers.

Cons:Low power. No "thumping" bass (but I don't really need that anyway, not trying to wake up the neighborhood).

Alpine's KTP-445A

Makes my Alpine CDE-147BT sound that much better. I tested first by having my HU powering all my Alpine speakers in my Silverado, and then adding this plug-n-play pack. I hear the difference. Sounds louder at a lower volume level, and when I turn it up- the sound is clean and much clearer than just powering my speakers off of the HU. I know it's do to the fact that my aftermarket speakers need more RMS power, and this unit does it. But amplifying your speakers with an external amp(other brand) doesn't guarantee that they'll sound good. With this addition, it reassures me that I'm getting the best sound out of my speakers. An I can say that, because I can tell. An yes, I'm sure the sound coming out of the HU would of been fine, but adding this power pack makes my music experience that much better!

Also , the cost to amplify the sound out of your speakers with this unit is less expensive than to have to buy: a amp(costs more), wiring kit, RCA cables, and maybe a new battery terminal to connect the power gauge wire to the amp from the battery. An at the end- the headache of installing and running power wires to a amp with a vehicle that might not be so installer friendly.

Pros:45 watts RMS power by 4 channels, with very easy installation. Clean sound at any volume level. If you can install a reciever in your vehicle, you can install this!

Cons:Depending on where you going to install this unit, you might find that you have way more provided cable than needed. Zip tie and tuck rest of the wiring out of the way. Funny, because it's the only "con" I could think of.

big sound, little box!

I thought my alpine unit (CDE-145 BT) had good sound with my speakers (Kenwoods in the front Infinity Reference) in the back, but this little baby gave those same speakers some pop! Now I don't have to crank them up just to hear subtle notes bot when I want to crank it, I got clean, crisp, clear rockin' sound. This little baby will NOT disappoint.

Pros:easy to install, plugs right in the Alpine units; no extra wiring; long enough wiring to remote mount.

Alpine KTP-445A Power Pack

I bought the alpine head unit cde-143bt to replace an old pioneer deck and wanted to try a little more power to push my 6 polk speakers that didn't have good sound quality with my sub. this small unit was everything I dreamed of without buying a big amp.. this little amp has brought my polks alive !!! the sound is perfect even pushing 6 spkers. the polks have punch to them now and beautiful sound quality. I am done !!! I have an suv with 2 dash spkers and 4 61/2 door spkers. I also have an amp and 12 inch ported sub. I'm 58 and a music lover and this is the best sounding unit I have ever had ! the great sound comes through with any kind of music! the power is there now. thank you for the great service and all the advice over the phone. your advisors need to listen a little better though. I had to splice my new deck in because he said I shouldn't need anything since I had a pioneer being replaced. no problem though. the install went great and I am very pleased. thanks again.